HD6473228P10V Datasheet, PDF (156/301 Pages) Renesas Technology Corp – Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp

Table 7-5. Effect of Changing Internal Clock Sources
No. Description
Low → Low:
CKS1 and CKS0 are
1
rewritten while both
clock sources are low.
Timing chart
Old clock
source
New clock
source
FRC clock
pulse
Low → High:
CKS1 and CKS0 are
2
rewritten while old
clock source is low and
new clock source is high.
FRC
N
N +1
CKS rewrite
Old clock
source
New clock
source
FRC clock
pulse
FRC
N
N +1
N +2
Table 7-5 (a)
CKS rewrite
High → Low:
CKS1 and CKS0 are
3
rewritten while old
clock source is high and
new clock source is low.
Old clock
source
New clock
source
FRC clock
pulse
*
Table 7-5 (b)
FRC
N
N +1
N +2
CKS rewrite
* The switching of clock sources is regarded as a falling edge that increments the FRC.
148
Table 7-5 (c)